I'd think that you'd want around 10 Ths (10 000 Ghs) to make it worthwhile. also you'd probably want to add a THs every month or so.
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I wouldn't even bother solo with this hashrate only 20+ if not more.
Right! And he'll only need 10,000 of those 2GHs Block Erupters to get to 20THs. Sounds like a great plan!
Silly, not the old block erupters. Maybe the new ones when the're done:
https://github.com/blockerupterI was talking about the new Gen3 AsicMiner Chips:
https://bitcointalk.org/index.php?topic=438359.0Rockminer is using the new chips:
http://www.rockminer.com/ , Good price too, 4 BTC for 2.6 THs = about $1.08/GH @ $700usb/BTC

, but 1.2W/Ghs

Shipping starts June 25th.. that's pretty good too
The new Rx-Box doesn't come with power supplies, so you'll have to factor that into costs too. Roughly 750 watts per box or 3000 Watts for the whole 4 units. Meanwhile Spondoolies SP30 will be 2400 Watts for 6 TH/s!!!!
I'm not impressed with Asicminer Gen 3 at all, they suck balls efficiency wise. Power supply costs and electrical costs negate the miner initial cost.